Rhabdomyomatous mesenchymal hamartoma presenting on a digit

Abstract

Rhabdomyomatous mesenchymal hamartoma is a rare dermal lesion comprised of skeletal muscle, adipocytes and collagen. The vast majority has been described in very young patients on the head and neck. To our knowledge, there are only two reports of rhabdomyomatous mesenchymal hamartoma outside the head and neck region. Both of those lesions were located in the perianal area. We describe a rhabdomyomatous mesenchymal hamartoma in a 36-year-old man located on the great toe. Although rhabdomyomatous mesenchymal hamartoma is uncommon, it is important to be aware of this entity, its possible association with congenital syndromes and its potential for localization outside of the head and neck region.